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package ui;

import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.IOException;
import javax.microedition.io.Connector;
import javax.microedition.io.ContentConnection;
import javax.microedition.lcdui.Image;

/**
 *
 * @author Ayman
 */
public class ImageLoader {

    /*--------------------------------------------------
     * Open connection and download png into a byte array.
     *-------------------------------------------------*/
    public static Image getImageFromUrl(String url) throws IOException {
        ContentConnection connection = (ContentConnection) Connector.open(url);

        // * There is a bug in MIDP 1.0.3 in which read() sometimes returns
        // an invalid length. To work around this, I have changed the 
        // stream to DataInputStream and called readFully() instead of read()
        // InputStream iStrm = connection.openInputStream();
        DataInputStream iStrm = connection.openDataInputStream();

        ByteArrayOutputStream bStrm = null;
        Image im = null;

        try {
            // ContentConnection includes a length method
            byte imageData[];
            int length = (int) connection.getLength();
            if (length != -1) {
                imageData = new byte[length];

                // Read the png into an array
                // iStrm.read(imageData);        
                iStrm.readFully(imageData);
            } else // Length not available...
            {
                bStrm = new ByteArrayOutputStream();

                int ch;
                while ((ch = iStrm.read()) != -1) {
                    bStrm.write(ch);
                }
                imageData = bStrm.toByteArray();
                bStrm.close();
            }

            // Create the image from the byte array
            im = Image.createImage(imageData, 0, imageData.length);
        } finally {
            // Clean up
            if (iStrm != null) {
                iStrm.close();
            }
            if (connection != null) {
                connection.close();
            }
            if (bStrm != null) {
                bStrm.close();
            }
        }
        return (im == null ? null : im);
    }
}


